<template>
    <div class="login_container">
        <div class="login_box">
            <div class="avatar_box" >
                <img src="../assets/logo.png" alt=""/>
            </div>
            <!--登录表单区-->
            <el-form ref="loginFormRef" :model="loginForm" :rules="loginFormRule" class="login_form">
                <!--用户名-->
                <el-form-item prop="username">
                    <el-input v-model="loginForm.username"  prefix-icon="iconfont icon-user"></el-input>
                </el-form-item>
                <!--密码-->
                <el-form-item prop="password">
                    <el-input  v-model="loginForm.password" show-password prefix-icon="iconfont icon-3702mima"></el-input>
                </el-form-item>
                 <!--按键区-->
                <el-form-item class="btns">
                    <el-button type="primary" @click="login">登录</el-button>
                    <el-button type="info" @click="restLoginForm">重置</el-button>
                </el-form-item>
            </el-form>
        </div>
    </div>
</template>

<script>
export default { 
   data() {
      return {
        loginForm: {
          username: 'admin',
          password: '123456'
        },
        loginFormRule:{
            username: [{ required: true, message: '请输入登录名称', trigger: 'blur' },
            { min: 4, max: 15, message: '长度在 6 到 15 个字符', trigger: 'blur' }],
            password: [{ required: true, message: '请输入密码', trigger: 'blur' },
            { min: 3, max: 6, message: '长度在 6 到 18 个字符', trigger: 'blur' }]
        }
      }
    },
    methods: {
        restLoginForm(){
            //console.log(this)
            this.$refs.loginFormRef.resetFields();
        },
        login(){
            this.$refs.loginFormRef.validate(async valid=>{
                //console.log(valid);
                if (!valid) return;
                //发起登录请示
                const {data: res} = await this.$http.post('login',this.loginForm);
                //console.log(res);
                if (res.meta.status !==200) return this.$message.error('登录失败!'); //console.log('登录失败')
                //console.log('登录成功')
                this.$message.success('登录成功!');
                //1.将登录成功的token保存到客户端sessionStorage中
                //1.1项目中除了登录之外的其他API接口，必须在登录之后才能访问
                //1.2token只应在当前网站打开期间生效 所以要保存到客户端sessionStorage中
                //console.log(res);
                window.sessionStorage.setItem('token',res.data.token);
                //2.通知编程式导航跳转到后台主页，主页地址是/home
                this.$router.push("/home");

                    
            });
        }
    }
    
}
</script>

<style lang="less">
.login_container{
    background-color: #2b4b6b;
    height: 100%;
}
.login_box{
    width: 450px;
    height: 300px;
    background-color: #fff;
    border-radius: 3px;
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%); 
    .avatar_box{
        height: 130px;
        width: 130px;
        border:1px solid #eee;
        border-radius: 50%;
        padding: 10px;
        box-shadow: 0 0 10px #ddd;    
        position: absolute;
        left: 50%;
        transform: translate(-50%, -50%); 
        background-color: #fff;
        img{
            width:100%;
            height: 100%;
            border-radius: 50%;
            background-color: #eee;
        }
    }
}
.btns{
    display: flex;
    justify-content: flex-end;
}
.login_form{
    position: absolute;
    bottom: 0;
    width: 100%;
    padding: 0 20px;
    box-sizing: border-box;
}

</style>